People, who choose Chrome (not even Chromium) over Firefox for a fraction of a second faster load speed of some pages (, which is often even "fake" as Google artificially slows down some pages for Firefox users or engineers them in Chrome optimization specific ways,) disregarding any privacy concerns, are simply not the target group of Firefox developers, because they do not care about privacy enhancing features. To…
That is false and defamatory. Chromium is noticeably faster than Firefox on a large swath of popular websites and web applications, the majority of which Google does not control; particularly on resource-constrained devices, and on Linux.
Memory usage comparisons on different machines with different pages and different other applications running are beyond meaningless. Chromium will use less memory if you don't have much, and it will use more if you have memory to spare; I'm sure Firefox will do some similar things.